<template>
    <el-button text @click="outerVisible = true">
      open the outer Dialog
    </el-button>
  
    <el-dialog v-model="outerVisible" title="Outer Dialog">
      <template #default>
        <el-dialog
          v-model="innerVisible"
          width="30%"
          title="Inner Dialog"
          append-to-body
        />
      </template>
      <template #footer>
        <div class="dialog-footer">
          <el-button @click="outerVisible = false">Cancel</el-button>
          <el-button type="primary" @click="innerVisible = true">
            open the inner Dialog
          </el-button>
        </div>
      </template>
    </el-dialog>
  </template>